Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d020b871de73bf…

MALICIOUS

PDF

67.6 KB Created: 2021-03-11 12:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f0156aa861a821430fd39aaa169b7578 SHA-1: 2485d65835743086f10910e3972c1d07596095a6 SHA-256: f2d020b871de73bfc5bfbfa7d654c0f52b5492d02d0a0e8187e7f21429e3a087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to obscure domains or files, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/aws?utm_term=pathfinder+2+character+sheet+fillable PDF link annotation
    • https://sagizebuwajap.weebly.com/uploads/1/3/1/4/131437005/rokezefulelogas.pdfIn PDF document text
    • https://levunabul.weebly.com/uploads/1/3/1/4/131407164/096433d61c8.pdfIn PDF document text
    • http://nebo-baikala.ru/batemans_bay_tide_guideippe7.pdfIn PDF document text
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/015d7f713.pdfIn PDF document text
    • http://korecos.ru/what_is_knowledge_economy_in_sociologyrbnqi.pdfIn PDF document text
    • http://damvglaz0.xyz/gevefeforipataroliwuxj85bn.pdfIn PDF document text
    • http://wonnaturila.space/74152471385oqvfs.pdfIn PDF document text
    • https://foxodutamawasu.weebly.com/uploads/1/3/4/5/134587344/9782674.pdfIn PDF document text
    • https://nulepapilix.weebly.com/uploads/1/3/5/9/135957677/wodomitavoxubekuwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zabevog/topifodemutiralonuw.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_66c7352f786f4d9e9ed554f60cecda00.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/qual_o_melhor_fone_de_ouvido_bluetooth_para_corrida.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_f963e3c502894fa6818a3263b61bae78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jonora/73827205652.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/sosirasogasuxuniwejogapa.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_6cc30f03de4d4afc8c8fd21589686c63.pdf?index=trueIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_c62cc50e96b84618bd657d2e153edc7d.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_bae605f8f28347dda97d4032522933b4.pdf?index=trueIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_787f12a5fd1b48b2b70952096aa3abaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/urinary_system.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_a818bfc10b234136846154e88532d3c8.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EF 5384 bytes
SHA-256: c4c786eb3065ddf7fc8e68a771e867ede72d020561936c3fffc7046742f950c1
font_01_sfnt_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 10908 bytes
SHA-256: a28803427c58b16bfbcfc5bd0887fb9ad231a5970893e2c2e36391e0d42b3d40

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